JPS5815236Y2 - Work vehicle with engine starting safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work vehicle having an engine start safety device that enables engine start based on a detection result that a clutch pedal has been operated to a clutch disengaged position.

With this type of work vehicle, only when the clutch is disengaged,
Since the engine can be started, it has the advantage of preventing danger to the work vehicle such as the machine moving forward or backward unexpectedly by starting the engine with the clutch engaged. After being used for a long period of time, the connecting parts such as wires that connect the clutch pedal and the clutch may become loose due to stretching or wear, leading to a situation where the clutch cannot be disengaged even if the clutch pedal is depressed a certain amount. However, in order to reliably disengage the clutch, the clutch pedal must be depressed more than a predetermined amount.

However, in the past, since the clutch pedal was designed to directly and rigidly actuate the clutch disengagement detection device, when the aforementioned elongation or rattling occurred, the pedal was moved by a predetermined amount in order to reliably disengage the clutch. If the detector is pressed too far, or even if there is no looseness, the detector will be operated more than necessary, and there is a risk that the detector will be damaged.

Therefore, it has been proposed to interlock the pedal and the detection tool with a spring material interposed between the two, and have the spring material absorb the pedal depression exceeding a predetermined amount, thereby preventing damage to the detection tool. However, in order for this spring material to have a sufficient buffering effect on the detection tool, it is necessary to make this spring material long.

By the way, if the spring material is made to be long in this way, problems arise in that it is difficult to pack the spring material compactly, and it becomes difficult to arrange it in relation to other parts.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to enable a compact structure of a pedal overpressure damping device including the spring material while ensuring a sufficient buffering effect on the detection tool.

That is, the work vehicle with the engine starting safety device according to the present invention has the following features:
A spring material interlocked with a clutch pedal is curved in a detour around the pedal support shaft, and the end portion thereof is configured as a contact actuation piece for a clutch release operation detector, Since the pedal is curved around the spindle, the spring material can be made relatively long, ensuring a sufficient buffering effect on the detection tool, and preventing damage to the detection tool when the pedal is depressed more than the predetermined amount. While reliably preventing
It has now become possible to arrange them in a relatively compact manner without being obstructed by other parts.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In agricultural vehicles such as combine harvesters, it is interposed between the shaft center of the output boob IJ-P1 of the engine E and the input boob IJP2 of the transmission M, which are interlockably connected via the transmission belt ■, and An operating arm 1a of a multi-plate main clutch 1, which connects and disconnects power to various drive mechanisms, is connected to an arm 3a of a main clutch pedal 3, which is swingably supported around a transverse support shaft 2 below the cockpit. They are connected via a release wire 4.

The pedal 3 is biased and held in a fixed position by a tension spring 5 stretched across the outer wire end fixing frame of the release wire 4 and the arm 3a, and a stopper 6 fixed to the frame. .

A band-shaped spring material 7 whose base end is fixed to the arm 3a,
It is formed in a detour curved state around the support shaft 2, and its free end 7a is connected to a clutch disengagement detection device, such as a cell starter 8 of the engine E, a power source 9, a manual switch 1, etc.
0 is connected in series to the engine starting circuit 12, and the normally open switch 11 is connected in series as a clutch disengagement operation detecting device. , the circuit 12, the pedal 3, and the clutch 1 interlocking structure constitute an engine starting safety device A.

When the main clutch pedal 3 is depressed against the spring 5, the main clutch 1 is disconnected via the wire 4, disabling power transmission from the engine E to the transmission M, and then freeing the spring material T. The end 7a is the switch 1
Close 1 and operate.

If the manual switch 10 is turned on in this state, or if it is turned on in advance, the cell starter 8 is activated and the engine E is started.

At this time, the main clutch 1 is in the disengaged state, so power is not transmitted to the transmission M.

Next, when the clutch pedal 3 is gradually released, the main clutch 1 is engaged and power is transmitted from the engine E to the transmission M.

When the pedal 3 is released, the switch 11 is opened and the operation of the cell starter 8 is stopped.
maintains its operating state by self-destruction of its fuel.

Incidentally, to stop the engine E, the accelerator lever (not shown) is operated to the stop position.

The wire 4 may stretch due to long-term use, and the pedal 3 and support shaft 2 may
If play occurs due to wear between the main clutch 1 and the main clutch 1, the pedal 3 must be depressed more than a predetermined amount in order to reliably disengage the main clutch 1. Since the spring material 7 is elastically deformed even if the pedal 3 is depressed by a predetermined amount or more, there is no risk of the switch 11 being damaged by being pressed too much.

As shown in Fig. 3, if the spring material 7 is made longer and curved around the support shaft 2 over a range of about 360 degrees, the amount of backlash absorbed can be further increased and the switch 11 can be more reliably prevented from being damaged.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of a working vehicle with an engine start safety device according to the present invention, in which FIG. 1 is an overall side view, FIG. 2 is a schematic side view of main parts, and FIG. 3 is a main part according to another embodiment. FIG. 2...Clutch pedal support shaft, 3...Clutch pedal, 7...Spring material, 7a...
・Free end portion, 11...Clutch disengagement operation detector,
12... Engine starting circuit, A... Engine starting safety device.

Claims (1)

[Claims for Utility Model Registration] ■ In a work vehicle having an engine start safety device A that enables engine start based on a detection result that the clutch pedal 3 has been operated to the clutch disengaged position, the clutch pedal 3 An engine starting safety device characterized in that a spring member 7 interlocked with the pedal is curved in a detour around the pedal support shaft 2, and its free end 7a is configured as a contact actuation piece for a clutch disengagement detection device 11. Work vehicle with attached. (2) The work vehicle with an engine starting safety device according to claim (2), wherein the clutch disengagement detection device 11 is a normally open switch installed in series with the engine starting circuit 12.